KR101483658B1 - Method for Producing Artificial Granule From Organic and Inorganic Sludge and Apparatus for Producing the Same - Google Patents

Abstract

The present invention relates to a method for producing an artificial granular soil material of inorganic and organic sludge and a manufacturing apparatus therefor, and more particularly to a method for producing an artificial granular soil material of inorganic and organic sludge, And a manufacturing apparatus therefor. A method for producing an artificial granular soil material comprises the steps of adding a recycled aggregate having an average diameter of 8 mm or less to sludge having a water content of 70 to 80 wt% at a rate of 5 to 20 wt% based on the weight of the sludge and kneading to prepare a sludge mixture; Charging the resulting sludge mixture in an amount of from 5 to 25 wt% of the sludge mixture with a mixed additive consisting of 70 to 94 wt% of inorganic fire retardant, 3 to 15 wt% of magnesium and 3 to 15 wt% of pH neutralizing agent; Adding the loess for controlling the water content and the chromaticity in an amount of 2 to 10 wt% of the sludge mixture; Mixing the sludge mixture with the mixed additive and the loess, and extruding the mixture at a high pressure to form a soil precursor; The soil precursor is cut in the extrusion process and the cut soil precursor is fed into a kiln type dryer; And drying the soil precursor to a granular form at a temperature of 100 to 350 < 0 > C in a dryer.

Description

TECHNICAL FIELD The present invention relates to a method for producing artificial granular soils of inorganic and organic sludge,

The present invention relates to a method for producing an artificial granular soil material of inorganic and organic sludge and a manufacturing apparatus therefor, and more particularly to a method for producing an artificial granular soil material of inorganic and organic sludge, And a manufacturing apparatus therefor.

Sludge refers to a mud-like material formed by sedimentation of micro-materials contained in water and is generally used in the same or similar meaning as sludge. In other words, it can mean organic or inorganic waste generated in various environments. The sludge can include, for example, household garbage or industrial waste. The sludge may be treated in an incinerator or treated in a physical or chemical manner to be regenerated and used as an embankment or as a cover material.

As a prior art related to sludge treatment, Patent Registration No. 0760029 entitled " Solidification treatment method and apparatus for utilizing sewage sludge as a cover material ". The prior art aims at minimizing the amount of ammonia gas generated by maintaining the pH value of a mixture of sewage sludge and neutral fires at a neutral value of less than 8.5 using a neutral fire. For the above-mentioned purpose, the prior art is a method in which ammonium sulfate is added to the sewage sludge in an amount of 15 to 25 parts by weight based on 100 weight part of sewage sludge mixed with calcium sulfate, calcium oxide or iron sulfate and magnesium oxide powder, having a mixing step for reducing the occurrence and second drive cement, calcium oxide, magnesium oxide or the curing agent from 5 to 10 parts by weight of in and through the mechanical curing step one or more il water content below 40%, the permeability is selected from the yeontanjae 1 × 10 ^{- 3} to 1 x 10 ^-6 cm / sec, and a compressive strength of not less than 0.5 kgf / cm 2 are provided on a landfill site.

Another prior art related to the treatment of sludge is Patent Registration No. 1120058, 'A method for producing a solidified soil composition for landfill using sewage and waste sludge'. The prior art includes a primary mixing step in which a heavy metal stabilizer is mixed with any one of sewage and sewage sludge, organic wastes, or a mixture thereof to prepare a first mixture; A secondary mixing step in which a reductant sludge ash, fly ash, calcium oxide, a solidifying promoter and an inorganic binder are mixed to prepare a secondary mixture; A third mixing step of mixing the first mixture and the second mixture to produce a third mixture; A fourth mixing step of mixing the third mixture with water, an inorganic acid and a deodorant to prepare a fourth mixture; And a fifth curing step in which the fourth mixture is cured by transferring the mixture to a curing tank, and a method for producing a solidified soil composition for a landfill using the sludge and sewage sludge.

The sludge treatment method disclosed in the prior art discloses the stability or environmental friendliness of treated solidified materials. The stability of the treated solidified material means that the treated solidified material can be maintained in a certain shape without restoring it to a form similar to sludge. And environmental friendliness means that the toxicity of treated sludge can be sufficiently removed. Inorganic sludge, organic sludge or sewage sludge, which is a known waste in the workplace, does not provide a specific solution for the removal of a simple moisture content and contamination of the surrounding environment due to odor or toxicity generated during the process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art and has the following objectives.

It is an object of the present invention to provide a method for producing an artificial granular soil material of inorganic and organic sludge which is environmentally friendly, while eliminating a large amount of water after the moisture is removed, and at the same time, eliminating toxicity.

Another object of the present invention is to provide an apparatus for producing artificial granular soils which enables the production of a soil material having a granular shape having a certain size and stability and environmental friendliness.

According to a preferred embodiment of the present invention, a method for producing an artificial granular soil material comprises the steps of charging recycled aggregate having an average diameter of 8 mm or less in sludge having a moisture content of 70 to 80 wt% in an amount of 5 to 20 wt% Kneading the mixture to prepare a mixture; Charging the resulting sludge mixture in an amount of from 5 to 25 wt% of the sludge mixture with a mixed additive consisting of 70 to 94 wt% of inorganic fire retardant, 3 to 15 wt% of magnesium and 3 to 15 wt% of pH neutralizing agent; Adding the loess for controlling the water content and the chromaticity in an amount of 2 to 10 wt% of the sludge mixture; Mixing the sludge mixture with the mixed additive and the loess, and extruding the mixture at a high pressure to form a soil precursor; The soil precursor is cut in the extrusion process and the cut soil precursor is fed into a kiln type dryer; And drying the soil precursor to a granular form at a temperature of 100 to 350 < 0 > C in a dryer.

According to another preferred embodiment of the present invention, an apparatus for producing an artificial granular soil material of inorganic and organic sludge comprises a primary hopper into which inorganic or organic sludge is introduced; A second hopper for inputting recycled aggregate; A kneader connected to the first hopper and the second hopper; A primary silo installed so as to feed the mixed additive into the kneader; A secondary silo installed so as to introduce yellow soil into the kneader; A mixing device connected to the kneader for feeding the sludge mixture; A sludge mixture transferred from the mixing apparatus is cut into a predetermined size during the extrusion process while being vacuum-mixed; And a sludge-type dryer in which the sludge mixture cut in the molding machine is dried to form a granular soil material.

According to another preferred embodiment of the present invention, the extruding device comprises a feed screw, a nozzle having a plurality of ejection holes, and a cutter.

The manufacturing method according to the present invention has an advantage in that the soil material can be made into a granular form having a certain diameter and thus can be easily handled and used for various purposes. The soil material according to the present invention has an advantage that the stability can be improved by having the effect of not absorbing moisture again after the odor is removed and the moisture is removed. The soil material produced by the manufacturing apparatus according to the present invention has an advantage that it can be used for various purposes such as embankment, grassland or gardening. Also, the soil material produced by the manufacturing apparatus according to the present invention has an advantage of being excellent in the prevention of pollution of the secondary leachate by the flooding of the embankment or the soil and the effect of removing the bad smell. Furthermore, the soil material produced by the manufacturing apparatus according to the present invention has an advantage of preventing the sponge phenomenon that may occur in the soil or the embankment.

Fig. 1 schematically shows an embodiment of a manufacturing method according to the present invention.
Figure 2 shows an embodiment of the device according to the invention.
Figure 3 shows an embodiment of an apparatus for forming granules in an apparatus according to the invention.
4A and 4B are photographs showing actual photographs of an embodiment of the soil material produced by the manufacturing method according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto. In the following description, components having the same reference numerals in different drawings have similar functions, so that they will not be described repeatedly unless necessary for an understanding of the invention, and the known components will be briefly described or omitted. However, It should not be understood as being excluded from the embodiment of Fig.

Fig. 1 schematically shows an embodiment of a manufacturing method according to the present invention.

The method for producing an artificial granular soil material according to the present invention is characterized in that a recycled aggregate having an average diameter of 8 mm or less in sludge having a moisture content of 70 to 80 wt% is added and kneaded at a ratio of 5 to 20 wt% Producing; Charging the resulting sludge mixture in an amount of from 5 to 25 wt% of the sludge mixture with a mixed additive consisting of 70 to 94 wt% of inorganic fire retardant, 3 to 15 wt% of magnesium and 3 to 15 wt% of pH neutralizing agent; Adding the loess for controlling the water content and the chromaticity in an amount of 2 to 10 wt% of the sludge mixture; Mixing the sludge mixture with the mixed additive and the loess, and extruding the mixture at a high pressure to form a soil precursor; The soil precursor is cut in the extrusion process and the cut soil precursor is fed into a kiln type dryer; And drying the soil precursor to a granular form at a temperature of 100 to 350 < 0 > C in a dryer.

This is explained in detail below.

The sludge to which the preparation method according to the present invention is applied includes organic or inorganic sludge, a mixture thereof, or household waste or industrial waste. Therefore, the method according to the present invention is not limited by the kind of sludge. The sludge can be pretreated in advance and, for example, at a suitable level, the water content can be adjusted to a level of 70 to 80 wt%. Moisture content can be controlled by the same method as natural drying or by applying heat during transport. The sludge can be prepared in the form of a mixture of 50 wt% of organic sludge and 50 wt% of inorganic sludge (S11), but the mixing ratio is not particularly limited. When the sludge mixture is prepared (S11), the recycled aggregate can be added to the mixture (S12). Recycled aggregate can be made from waste-foundry sand, waste-anthracite, waste-to-soil, and waste-to-dust. The recycled aggregate can be made to have an average diameter of less than 8 mm and can be made through processes such as, but not limited to, mixing-sorting-desalting-milling-crushing-granulation-neutralizing. The kind of the recycled aggregate is not particularly limited, and only a process of neutralizing to an appropriate level by adding a neutralizing agent while controlling the average diameter through pulverization, particle size control and neutralization process can be performed. Recycled aggregate can be manufactured in various ways, and the present invention is not limited to the embodiments shown.

The prepared recycled aggregate can be kneaded in an amount of 5 to 20 wt% based on the weight of the entire sludge (S12). In general, kneading refers to a state in which particles are mixed in a state of no destruction of particles. In this specification, kneading and mixing are used in the same or similar meaning unless otherwise specified. The kneading of the sludge and the recycled aggregate can be accomplished by, for example, mixing the mixture through a transfer conveyor after being injected through different hoppers.

When the sludge and the recycled aggregate are kneaded, when the mixture is made (S12), the mixed additive may be added (S13). The blend additive may comprise from 70 to 94 wt% of an inorganic filler, from 3 to 15 wt% of magnesium and from 3 to 15 wt% of a pH neutralizing agent and may be added to the sludge mixture in an apparatus such as a silo. The inorganic fireproofing can be, but is not limited to, for example, slag powder in a furnace, lime, quicklime, anhydrous gypsum, fly-ash, cement clinker raw materials, silica, clay or mixtures thereof. The pH neutralizing agent can be, for example, limestone, slaked lime, quicklime, carbide or mixtures thereof. The inorganic fire retardant or pH neutralizing agent may be appropriately selected depending on the type of sludge or recycled aggregate, and the present invention is not limited to the embodiments shown. The mixed additive may be added in an amount of 2 to 10 wt% of the sludge mixture and may be introduced into the sludge mixture through a device such as a silo.

When the mixed additive is added to the sludge mixture (S13), yellow soil may be added through another route (S14). The loess can be added for controlling the water content and for controlling the chromaticity, and the sludge mixture can be added in an amount of 2 to 10 wt%. Generally, loess is composed of silica and soil containing hydrous iron oxide and anhydrous iron oxide, and has red or yellow color and can be used as a vehicle. According to the present invention, the loess is made into powder and can be input. For example, loess is collected and put into a device such as a stirrer with water, and it can be rotated while stirring for 10 to 60 minutes. After the precipitation, the upper part of the precipitate can be recovered and dried. Then, the dried yellow loess is made into a powder form and can be introduced into the sludge mixture through a device such as a silo (S14).

The sludge mixture, recycled aggregate and loess can be kneaded in a suitable kneading apparatus and mixed with a mixer. Mixing can be accomplished in a device that can be rotated while being rotated by a device such as a screw. The mixing may be a primary mixing and a secondary mixing. The primary mixing can be done with a screw-like transfer and the secondary mixing can be vacuum mixing. Vacuum mixing means that mixing is performed at a certain level of low pressure. For example, atmospheric pressure means mixing at a level of 1/2 to 1/1000. By the vacuum mixing, moisture existing at the same place as the micropores in the mixture can be discharged to the outside, and the fine dust component can be removed at the same time. The vacuum condition is not particularly limited. For example, when the pressure is too low, the particle structure of the mixture may be damaged, and when the pressure is high, fine dust or water is not sufficiently discharged. Therefore, the vacuum pressure can be, for example, a level of 1/2 to 1/1000 of the atmospheric pressure. The vacuum mixing may be performed by stirring in a state in which the pressure is sufficiently low or by slowly rotating the container, or by a method of continuously discharging the discharged air or moisture using a vacuum pump. Vacuum mixing may be carried out for, for example, 1 to 5 hours, but may be adjusted to an appropriate level depending on the volume of the container or the type of sludge, and the present invention is not limited thereto.

The mixture which has been vacuum-mixed can be cut to a certain size by being extruded through the extruder again. Specifically, the extrusion may be performed through a nozzle having a plurality of injection holes formed at a high pressure through a device such as a screw. High pressure extrusion refers to the extrusion of the mixture by pressure and may be exerted by a device such as a screw. A cutter may be installed at the entrance of the exposure to which the mixture is extruded, and the extruded mixture may be cut to a predetermined size by the cutter to be made into a soil precursor (S15). The soil precursor is then introduced into the kiln type dryer and dried (S16).

The dryer can be rotated and the soil precursor can be made into granules while being dried at a temperature of 100 to 350 DEG C, and the diameter of the granules can be determined by the size of the cut, for example the diameter can be from 8 to 15 mm . The rotational speed of the dryer can be, for example, 10 to 200 rpm and can be dried for 1 to 20 hours.

The prepared granular soil material is an embankment. It can be used for soil or gardening. The soil material according to the present invention has an advantage that it is easy to handle and has a low water absorption rate and toxicity is removed because it is made into a granular form, thereby being environmentally friendly.

The manufacturing process shown in FIG. 1 is illustrative and the present invention is not limited to the embodiments shown.

The method according to the invention can be applied to various devices.

Figure 2 shows an embodiment of the device according to the invention.

Referring to FIG. 2, the apparatus for producing artificial granular soils according to the present invention comprises a first hopper 11 into which inorganic or organic sludge is introduced; A second hopper 12 for inputting recycled aggregate; A kneader (13) connected to the first hopper and the second hopper; A primary silo (14) provided so as to feed a mixing additive into the kneader (13); A secondary silo (15) installed so as to introduce yellow soil into the kneader (13); A mixing device (16) connected to the kneader (13) to feed the sludge mixture; The sludge mixture transferred from the mixing device 16 is sieved by a molding machine 17 and a molding machine 17 for cutting the sludge mixture into a predetermined size during the extrusion process while vacuum mixing the sludge mixture is dried in a kiln type dryer 18).

The primary hopper 11 and the secondary hopper 12 may be of any type capable of injecting sludge and recycled aggregate and may be connected to a conveying device such as a conveyor C, respectively. The first hopper 11 and the second hopper 12 are separately installed so that the amount of the recycled aggregate is appropriately controlled according to the amount of the sludge introduced and at the same time the sludge and the recycled aggregate are mixed with the mixed additive and the loess . As an alternative, the sludge and the recycled aggregate may be mixed in advance and introduced through one hopper, but the mixing apparatus must be installed separately, which can complicate the apparatus. The amounts of sludge and recycled aggregate fed through the primary and secondary hoppers 11, 12 can be the same amounts as described above.

A primary silo 14 and a secondary silo 15 may be installed on the other side of the conveyor C. [ The mixed additive and the loess may be introduced through the primary silo 14 and the secondary silo 15, respectively. The sludge, the recycled aggregate, the mixed additive and the loess fed through the respective hoppers 11 and 12 and the respective silos 14 and 15 can be fed through the conveyor C and fed into the kneader 13 . Each hopper 11, 12 and each silo 14, 15 can have a control valve capable of controlling the amount and the amount conveyed through the conveyor C can be controlled. And the amount to be injected through the kneader 13 can be adjusted to the amount described in connection with the embodiment of FIG. The sludge mixture primarily kneaded in the kneader (13) can be mixed again while being conveyed through the mixing device (16). The agitator may be installed inside the kneader 13 if necessary, but it is not necessarily required. The mixing device 16 may be, for example, a conveying device such as a screw. The sludge mixture kneaded in the kneader (13) can be mixed again while being conveyed through the mixing device (16). The sludge mixture transferred through the mixing device 16 can be introduced into the molding machine 17. The molding machine 17 may be composed of a vacuum mixing device and an extrusion device, and in the vacuum mixing device, the sludge mixture may be subjected to vacuum mixing and the vacuum mixing device may include a device such as a vacuum pump. The vacuum mixing device may have a screw therein as needed, and the sludge mixture may be conveyed to the extruder by mixing with the screw. In the extrusion apparatus, the sludge mixture can be formed into a soil precursor by extrusion molding to a predetermined size. The process of forming the soil precursor into a predetermined size by extrusion in the molding machine 17 will be described below.

The soil precursor may be introduced into the dryer 18. The dryer 18 may be in the form of a kiln or a rotary kiln, for example, and may have a temperature controllable structure. The dryer 18 may form the artificial granular soil material by rotating the soil precursor, for example, at a temperature of 100 to 350 DEG C while rotating the soil precursor. The artificial soil material thus produced is conveyed to the conveyor (C), collected in the container (19), and can be used for the embankment, the soil material or the garden.

The embodiment shown in FIG. 2 is illustrative and the present invention is not limited by the embodiments shown.

An embodiment of the molding machine 17 according to the present invention will be described below.

Figure 3 shows an embodiment of an apparatus for forming granules in an apparatus according to the invention.

3, the molding machine 17 includes a mixing screw 171 for mixing and feeding the sludge mixture fed through the inlet IN into which the sludge mixture is injected and the inlet IN, And a cutter 173 provided at the front of the nozzle 172 and the nozzle 172.

The mixing screw 171 can be accommodated inside the housing H and the interior of the housing H can be made to a pressure of 1/2 to 1/1000 of the atmospheric pressure, for example, by the vacuum pump P have. If necessary, a heater for maintaining the inside of the housing H at a predetermined temperature may be installed. The conveying screw 171 may have a stirring blade 171a protruding perpendicularly to the longitudinal direction, and the sludge mixture may be conveyed while being sufficiently mixed by the stirring blade. The moisture generated in the vacuum mixing process can be discharged to the outside by the vacuum pump P and the sludge mixture transferred by the transfer screw 171 can be transported to the nozzle 172. The nozzle 171 can be made to have a sufficiently small cross section as compared with the housing H while being extended to a predetermined length. A storage space may be formed between the housing H and the nozzle 172 as necessary. The sludge mixture stored in the storage space is caused to extrude the sludge mixture through the nozzle 172 by the pressure applied from the feed screw 171. A plurality of extrusion holes 172a can be installed in the nozzle 172, The cutter 173 may be formed in front of the nozzle 172. The cutter 173 may be rotated at a constant speed or may be rotated by a nozzle 172. The rotating speed or moving speed of the cutter 173 is adjusted appropriately in consideration of the extrusion speed of the sludge mixture and the diameter of the granules .

The soil precursor which has been cut to the appropriate size by the cutter 173 can be transferred to the dryer as described above.

Various types of molding machines can be applied to the production apparatus according to the present invention and the present invention is not limited to the embodiments shown.

Figures 4a and 4b illustrate embodiments of the granular soil material produced by the manufacturing method or apparatus of the present invention.

Referring to FIG. 4A, the artificial granular soil material may be elliptical or circular, and may have a granular shape. It is possible to produce soil materials having various diameters and to make various colors appear as needed. The manufactured soil material is simple to handle and low in water absorption rate, so that the original shape can be maintained even when exposed to moisture for a long time. In addition, odor or toxicity can be removed and used for various purposes.

On the other hand, referring to FIG. 4B, it can be seen that the artificial granular soil material can be formed into a cylindrical shape and pores are formed therein. The produced artificial granular soil material has a low water uptake rate due to the air components filled in the pores formed therein, and can be broken into particles when an appropriate force is applied. As a result, the artificial granular soil material according to the present invention can be used for horticultural use including embankment or soil material.

The manufacturing method according to the present invention has an advantage in that the soil material can be made into a granular form having a certain diameter and thus can be easily handled and used for various purposes. The soil material according to the present invention has an advantage that the stability can be improved by having the effect of not absorbing moisture again after the odor is removed and the moisture is removed. The soil material produced by the manufacturing apparatus according to the present invention has an advantage that it can be used for various purposes such as embankment, grassland or gardening. Also, the soil material produced by the manufacturing apparatus according to the present invention has an advantage of being excellent in the prevention of pollution of the secondary leachate by the flooding of the embankment or the soil and the effect of removing the bad smell. Furthermore, the soil material produced by the manufacturing apparatus according to the present invention has an advantage of preventing the sponge phenomenon that may occur in the soil or the embankment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention . The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

11: first hopper 12: second hopper
13: kneader 14: primary silo
15: Secondary silo 16: Mixing device
17: Molding machine 18: dryer
171: Mixing screw 172: Nozzle
172a: Extrusion hole 173: Cutter

Claims (3)

Adding recycled aggregate having an average diameter of 8 mm or less to sludge having a water content of 70 to 80 wt% at a weight of 5 to 20 wt% based on the weight of the sludge, and kneading to prepare a sludge mixture;
Charging the resulting sludge mixture in an amount of from 5 to 25 wt% of the sludge mixture with a mixed additive consisting of 70 to 94 wt% of inorganic fire retardant, 3 to 15 wt% of magnesium and 3 to 15 wt% of pH neutralizing agent;
Adding the loess for controlling the water content and the chromaticity in an amount of 2 to 10 wt% of the sludge mixture;
Mixing the sludge mixture with the mixed additive and the loess, and extruding the mixture at a high pressure to form a soil precursor;
The soil precursor is cut in the extrusion process and the cut soil precursor is fed into a kiln type dryer; And
Wherein the soil precursor is dried to a granular form at a temperature of 100 to 350 < 0 > C in a drier. An apparatus for producing artificial granular soils of inorganic and organic sludge,
A first hopper 11 into which inorganic or organic sludge is fed;
A second hopper 12 for inputting recycled aggregate;
A kneader (13) connected to the first hopper and the second hopper;
A primary silo (14) provided so as to feed a mixing additive into the kneader (13);
A secondary silo (15) installed so as to introduce yellow soil into the kneader (13);
A mixing device (16) connected to the kneader (13) to feed the sludge mixture;
The sludge mixture transferred from the mixing device 16 is subjected to vacuum mixing and a molding machine 17 for cutting the sludge into a predetermined size during the extrusion process; And
And a kiln type dryer (18) for drying the sludge mixture cut at the molding machine (17) to form a granular soil material. The apparatus for manufacturing artificial granular soils according to claim 2, wherein the extrusion apparatus (17) comprises a feed screw (171), a nozzle (172) having a plurality of ejection holes, and a cutter.

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